Do any One Know an alternative for Digital Pot or Digital Pot highest Value 100 Mega Ohm?

[Kailash198]

As I'm Building a Project related to Healthcare I need a Resistor of Various Value like 10 M, 2 M, 550 K etc so if a I can get this values encapsulated in Single Chip so it will be a Great. Please Suggest me with Appropriate Help.
Thank You.

 

[Diver300]

It is very difficult to work with resistances that high as leakage current can easily take more current than the resistor.

I don't think that digital potentiometers are made with values that high.

Digital potentiometers are actually made as many fixed resistors, connected by solid-state relays. If you only need a few values, you could used separate resistors and relays. The relays could be solid state or mechanical.

 

[ronsimpson]

Maybe if you post that portion of you schematic.

 

[schmitt trigger]

The highest available Digipots are 1 Meg.

 

[gophert]

The highest available Digipots are 1 Meg.

how much board space would it take to place 100 in series? Ha

 

[ronsimpson]

10 M, 2 M, 550 K etc so if a I can get this values encapsulated in Single Chip

You can but it will cost!
Really we don't know enough about your needs to comment now.

Years ago I had many 20 pin modules like this made up with different resistors printed on them.

 

[atferrari]

The highest available Digipots are 1 Meg.

Didn't know such high do exist? Brand?

 

[ronsimpson]

Didn't know such high do exist? Brand?

AD5242BRZ1M, AD5222BR1M, AD5241BRZ1M,
--edited--
We do not know what Kailash198 wants. Probably a differential amp. Those resistors are common all in one part.
Just a guess.